IPhone 5 :: Invalid Sim After 8.1.1 Update

After taking the iOS 8.1.1 update to my iPhone5 periodically displays an "invalid SIM" warning. Not very often, but enough that it is annoying. If I turn my phone off, then back on, my SIM card is good and the phone works fine.Â

After waiting on hold for 45 minutes the apple care representative gave me this list of things to try... If you see 'No SIM' alert on iPhone Learn what to do if you see an "Invalid SIM" or "No SIM Card installed" alert on your iPhone.In some situations, the status bar on your iPhone might display No SIM, even though your iPhone has a SIM card. You might see an alert saying "Invalid SIM" or "No SIM Card installed."If you see any of the above symptoms on your iPhone, follow these steps:Update your iPhone to the latest version of iOS.Turn airplane mode on and then off again.Restart your iPhone.Check for a carrier settings update. Go to Settings > General > About. Install any available update.Remove the SIM card and make sure that it's a valid SIM that your carrier provided.

Also make sure that it's not damaged, worn, or modified. Then reinsert it.A SIM tray that comes with one iPhone model won't necessarily work with a different iPhone model. When you insert the correct SIM tray, the SIM tray should be flush with the device.If you have another SIM card, insert it. You can use a SIM card from any phone with the same format as your iPhone SIM card. If your iPhone works with that SIM card, contact the carrier that issued your original SIM card.Restore the iPhone.If you still see the issue, contact Apple support. I have just gone threw the "Restore the iPhone" step. We shall see if it happens again... Stay tuned!

Info:
iPhone 5, iOS 8.1.1